$\frac{x^5+x^4+2x+3}{x-1}$
$\frac{\frac{1}{\cos\left(x\right)}+\frac{1}{\sin\left(x\right)}}{\frac{1}{\cos\left(x\right)}-\frac{1}{\sin\left(x\right)}}$
$\lim_{x\to0}\left(\frac{cosx-1}{e^{2x}-x-1}\right)$
$\frac{3x+9}{2x+1}+2$
$\left(5x^2-3x\right)\left(5x^2+4x\right)$
$2-1-6$
$\lim_{x\to-\infty}\left(\frac{\sqrt{1+x^2}}{1-x}\right)$
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